diff --git a/light-meter/rtr-light-meter.md b/light-meter/rtr-light-meter.md
index e274a4f..a2d7fd6 100644
--- a/light-meter/rtr-light-meter.md
+++ b/light-meter/rtr-light-meter.md
@@ -268,3 +268,31 @@ easier to test the bespoke shutdown procedure is working as
 intended. You can, also, adjust the time in the crontab or run the
 script by running the script like you normally would but I find them
 to be frustrating to do in this instance.
+
+## Running the Program
+
+You should not need to run the program manually (after you have set
+everything up). With that said, you can make sure the software works
+by running the following commands,
+
+```python
+# This assumes you have followed the set-up steps above and you are
+# not running the code in a virtual environment.
+
+# Adjust the path to match the location of the .py file.
+python3 /home/rtrp/repos/light-meter/cli_meter.py
+```
+
+There is a GUI program which you can run which runs locally. I used
+this for testing and probably have not used it since the very early
+stages of developing this project. It basically displays the light
+levels on a screen. This requires Raspbain (RaspberryPi OS) to have it
+desktop environment installed. To run it,
+
+```python
+# This assumes you have followed the set-up steps above and you are
+# not running the code in a virtual environment.
+
+# Adjust the path to match the location of the .py file.
+python3 /home/rtrp/repos/light-meter/light_meter.py
+```